Two-stage coal gasification and desulfurization
The present invention is directed to a system which effectively integrates a two-stage, fixed-bed coal gasification arrangement with hot fuel gas desulfurization of a first stream of fuel gas from a lower stage of the two-stage gasifier and the removal of sulfur from the sulfur sorbent regeneration gas utilized in the fuel-gas desulfurization process by burning a second stream of fuel gas from the upper stage of the gasifier in a combustion device in the presence of calcium-containing material. The second stream of fuel gas is taken from above the fixed bed in the coal gasifier and is laden with ammonia, tar and sulfur values. This second stream of fuel gas is burned in the presence of excess air to provide heat energy sufficient to effect a calcium-sulfur compound forming reaction between the calcium-containing material and sulfur values carried by the regeneration gas and the second stream of fuel gas. Any ammonia values present in the fuel gas are decomposed during the combustion of the fuel gas in the combustion chamber. The substantially sulfur-free products of combustion may then be combined with the desulfurized fuel gas for providing a combustible fluid utilized for driving a prime mover. 1 fig.
- Research Organization:
- USDOE Morgantown Energy Technology Center, WV (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- Assignee:
- Dept. of Energy
- Patent Number(s):
- PATENTS-US-A7562298
- Application Number:
- ON: DE92017153; PAN: 7-562,298; NC: NONE
- OSTI ID:
- 10160061
- Resource Relation:
- Other Information: PBD: 3 Aug 1990
- Country of Publication:
- United States
- Language:
- English
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